Induction coil



Dec. 14. 1926. 1,610,416

' A. BOEDEKER ET AL INDUCTION COIL Filed March '7, 1925 F163. Hal.

Patented Dec. 14, 1926.

UNITED STATES PATENT OFFICE.

ANTHONY BOEDEKER, OF CINCINNATI, AND JESSE S. W'ENTWORTH, F NORWOOD, OHIO, ASSIGNORS TO G-RANDTONE RADIO CORPORATION, OF CINCINNATI, OHIO, A

CORPORATION OF QHIO.

INDUCTION COIL.

Application filed March 7. 1925.

Our invention relates more particularly to mounting radio tuning or receiving coils, and belongs to that class of induction coils.

The coil is composed of primary and sect ondary windings, the primary being suspended in mid-air, and the secondary being slidably mounted, within or without the primary.

These primary and secondary windings are supported and suspended in an unique and novel manner, iving marked utility to our induction coil.

The device is simple in construction and highly efiicient in use, as will readily be come apparent from the following specification.

In the accompanying drawing forming part of this specification:

Fig. 1, is a frontelevation of our new radio tuning or receiving or induction coil,

Fig. 2, is a plan view, in elevation,

Fig. 3, is a section taken on line 33 of Fig. .4, showing secondary coil in raised position and Fig. 4;, is a cross-section of parts shown in Fig. 3 taken on line 4t4t.

In carrying out our invention, we provide a frame work, formed in the present instance of a bottom or base 1, a top 2 and uprights 3, at each corner.

In the top 2, we fasten or secure one end of the supporting strings 4, the other end being fastened or secured in the base or bottom 1: these strings are drawn taut and carry a primary coil 5; this coil is suspended above the bottom 1, a space 6 being left at the bottom to keep the coil 5 from any extraneous influences.

We also provide a secondary coil 7, suspended on supporting cords 8, which are fastened to the ears 9, mounted on the coil 7.

Securely connected or fastened, at one end, in the top 2. the cords 10 depend down ward and are. held taut by being fastened in the base 1. These cords 10 guide the coil 7 in its upward and downward movement,

Serial No. 13.769.

thus said coil 7 is adjustable. This adjustable movement is formed by drawing up and down on the supporting cords 8, this movement carrying the coil 7 up or down into any desired position.

The wires 13 and 14 form part of circuit for the secondary coil and the leads or tappets 15, are the connecting points or terminals to make a complete circuit for the primary.

The coil 7 may be drawn upwardly and downwardly for varying positioned relations to coil 5, by any desirable means found convenient and practicable.

The strings 8 act as shafts upon which the secondary coil 7 travels, in its upward and downward movement.

The windings of the coils may be of any desired form found dependable.

l e have shown a preferred form of our induction coil, but do not wish. to limit ourselves to any precise form or construction, but may vary the same to some extent which change will fall within the scope of this specification and claim.

lVhat we claim as new and our invention and desire to secure by Letters Patent is:

A variable induction coil comprising, a frame, cords arranged in spaced relation and in parallelism and stretched tight within said frame, a fixed prin'iary wine ing secured to said cords and spaced from the ends and sides of said frame. a second series of cords disposed within the said primary winding and out of contact therewith and stretched tight and parallel to the first named set of cords, a secondary winding within and coaxial with the fixed primary winding supported by and slidable upon said secondary set of cords, and means for sliding said secondary winding.

In testimony whereof, we attix our signatures at Cincinnati, hio, this 4th day of March, 1925.

ANTHONY BOEDEKER. JESSE S. VENTVORTH. 

